The problem is the following:
AFR uses standard (classical) regular expressions. According to these
expressions you may create expressions that match to given text.
But you cannot create expressions that does not include the text.

So you may easily create expression which finds all users having
timeout= and maxnrusers= text. But it's impossible to find users not
having timeout= and maxnrusers= text.

What we are thinking about: maybe we may extent standard regular
expressions by adding the command to find text not having given
substring.

We recorded it into our ToDo list. We will send you email when it will
be ready.

I said it's impossible to find text not having substrings.
But what we can do: take your INI file and remove from the users
having
Timeout= and MaxNrUsers=
what will be left in the INI file? Users not having Timeout= and
MaxNrUsers= !

So you may use the software already now.

Step by step instructions.

When you need to find users not having Timeout= and MaxNrUsers=
take
your INI file and put it (copy) into temp folder. For example,
C:\Program Files\Advanced Find and Replace\test